Wes McKinney created ARROW-1587:
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Summary: [Format] Add metadata for user-defined logical types
Key: ARROW-1587
URL: https://issues.apache.org/jira/browse/ARROW-1587
Project: Apache Arrow
Issue Type: Improvement
Components: Format
Reporter: Wes McKinney
Fix For: 0.8.0
While we have the custom_metadata field at the Field level, it may be useful to
have a proper user-defined type metadata in the `Type` union, which would allow
us to provide a physical representation type (e.g. "Latitude longitude is
represented by a struct, whose children consist of two doubles") from the other
non-user defined types.
This is more flexible than {{custom_metadata}} because we can leverage existing
structure in the Flatbuffers for describing the user type
https://github.com/apache/arrow/blob/master/format/Schema.fbs#L285
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